Set correctly the memory attributes for the kernel PE sections
Resolves: #RHEL-106075 Signed-off-by: Leo Sandoval <lsandova@redhat.com>
This commit is contained in:
Leo Sandoval
parent
f63b7984e5
commit
b6fea26353
342
0480-Set-correctly-the-memory-attributes-for-the-kernel-P.patch
Normal file
342
0480-Set-correctly-the-memory-attributes-for-the-kernel-P.patch
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@ -0,0 +1,342 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Leo Sandoval <lsandova@redhat.com>
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Date: Mon, 28 Jul 2025 12:37:06 -0600
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Subject: [PATCH] Set correctly the memory attributes for the kernel PE
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sections
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Currently the whole kernel memory region is set to RO, so at some
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point when execution is passed to the kernel, the latter faults on a
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memory write access, e.g. zeroing .bss section. The proposed change
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sets the memory attribute appropriately for each kernel PE section.
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Signed-off-by: Leo Sandoval <lsandova@redhat.com>
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---
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grub-core/loader/arm64/linux.c | 2 +-
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grub-core/loader/efi/linux.c | 165 ++++++++++++++++++++++++++++----------
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grub-core/loader/i386/efi/linux.c | 5 +-
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include/grub/efi/linux.h | 7 ++
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include/grub/efi/pe32.h | 28 +++++++
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5 files changed, 161 insertions(+), 46 deletions(-)
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diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
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index a3a193c255..c03e602974 100644
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--- a/grub-core/loader/arm64/linux.c
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+++ b/grub-core/loader/arm64/linux.c
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@@ -182,7 +182,7 @@ grub_arch_efi_linux_boot_image (grub_addr_t addr, grub_size_t size, char *args,
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grub_dprintf ("linux", "linux command line: '%s'\n", args);
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- retval = grub_efi_linux_boot (addr, size, handover_offset,
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+ retval = grub_efi_linux_boot (addr, size, 0, handover_offset,
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(void *)addr, nx_supported);
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/* Never reached... */
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diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
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index e413bdcc23..4d7cd3c624 100644
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--- a/grub-core/loader/efi/linux.c
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+++ b/grub-core/loader/efi/linux.c
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@@ -24,6 +24,7 @@
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#include <grub/efi/efi.h>
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#include <grub/efi/pe32.h>
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#include <grub/efi/linux.h>
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+#include <grub/safemath.h>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-align"
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@@ -133,20 +134,130 @@ grub_efi_check_nx_required (int *nx_required)
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typedef void (*handover_func) (void *, grub_efi_system_table_t *, void *);
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grub_err_t
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-grub_efi_linux_boot (grub_addr_t kernel_addr, grub_size_t kernel_size,
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+grub_efi_mem_set_att (grub_addr_t kernel_address, grub_size_t kernel_size,
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+ grub_size_t kernel_start, int nx_supported)
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+{
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+ grub_addr_t kernel_start_address = kernel_address + kernel_start;
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+
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+ grub_uint64_t default_set_attrs = GRUB_MEM_ATTR_R | GRUB_MEM_ATTR_W | GRUB_MEM_ATTR_X;
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+ grub_uint64_t default_clear_attrs = 0;
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+ grub_uint64_t stack_set_attrs = default_set_attrs;
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+ grub_uint64_t stack_clear_attrs = default_clear_attrs;
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+ grub_uint64_t kernel_set_attrs = default_set_attrs;
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+ grub_uint64_t kernel_clear_attrs = default_clear_attrs;
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+ grub_uint64_t attrs;
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+
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+ struct grub_msdos_image_header *header;
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+ struct grub_pe_image_header *pe_image_header;
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+ struct grub_pe32_coff_header *coff_header;
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+ struct grub_pe32_section_table *section, *sections;
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+ grub_uint16_t i;
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+ grub_size_t sz;
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+
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+ header = (struct grub_msdos_image_header *)kernel_address;
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+
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+ if (grub_add ((grub_addr_t) header, header->pe_image_header_offset, &sz))
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+ return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("Error on PE image header address calculation"));
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+
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+ pe_image_header = (struct grub_pe_image_header *) (sz);
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+
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+ if (pe_image_header > (kernel_address + kernel_size))
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+ return grub_error (GRUB_ERR_BAD_OS, N_("PE image header address is invalid"));
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+
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+ if (grub_memcmp (pe_image_header->signature, GRUB_PE32_SIGNATURE,
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+ GRUB_PE32_SIGNATURE_SIZE) != 0)
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+ return grub_error (GRUB_ERR_BAD_OS, N_("kernel PE magic is invalid"));
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+
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+ coff_header = &(pe_image_header->coff_header);
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+ grub_dprintf ("nx", "coff_header 0x%"PRIxGRUB_ADDR" machine %08x\n", (grub_addr_t)coff_header, coff_header->machine);
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+
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+ if (grub_add ((grub_addr_t) coff_header, sizeof (*coff_header), &sz) ||
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+ grub_add (sz, coff_header->optional_header_size, &sz))
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+ return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("Error on PE sections calculation"));
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+
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+ sections = (struct grub_pe32_section_table *) (sz);
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+
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+ if (sections > (kernel_address + kernel_size))
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+ return grub_error (GRUB_ERR_BAD_OS, N_("Section address is invalid"));
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+
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+ /* Parse the PE, remove W for code section, remove X for data sections, RO for the rest */
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+ for (i = 0, section = sections; i < coff_header->num_sections; i++, section++)
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+ {
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+ kernel_set_attrs = default_set_attrs;
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+ kernel_clear_attrs = default_clear_attrs;
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+
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+ if (nx_supported)
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+ {
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+ if (section->characteristics & GRUB_PE32_SCN_MEM_EXECUTE)
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+ {
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+ /* RX section */
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+ kernel_set_attrs &= ~GRUB_MEM_ATTR_W;
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+ kernel_clear_attrs |= GRUB_MEM_ATTR_W;
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+ }
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+ else if (section->characteristics & GRUB_PE32_SCN_MEM_WRITE)
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+ {
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+ /* RW section */
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+ kernel_set_attrs &= ~GRUB_MEM_ATTR_X;
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+ kernel_clear_attrs |= GRUB_MEM_ATTR_X;
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+ }
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+ else
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+ {
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+ /* RO section */
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+ kernel_set_attrs &= ~GRUB_MEM_ATTR_W & ~GRUB_MEM_ATTR_X;
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+ kernel_clear_attrs |= GRUB_MEM_ATTR_X | GRUB_MEM_ATTR_W ;
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+ }
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+ }
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+
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+ /* Make sure we are inside range */
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+ if (grub_add ((grub_addr_t) kernel_address, section->raw_data_offset, &sz))
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+ return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("Error on PE Executable section calculation"));
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+
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+ grub_update_mem_attrs (sz, section->raw_data_size, kernel_set_attrs, kernel_clear_attrs);
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+
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+ grub_get_mem_attrs (sz, 4096, &attrs);
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+ grub_dprintf ("nx", "permissions for section %s 0x%"PRIxGRUB_ADDR" are %s%s%s\n",
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+ section->name,
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+ (grub_addr_t)sz,
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+ (attrs & GRUB_MEM_ATTR_R) ? "r" : "-",
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+ (attrs & GRUB_MEM_ATTR_W) ? "w" : "-",
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+ (attrs & GRUB_MEM_ATTR_X) ? "x" : "-");
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+ }
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+
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+ if (grub_stack_addr != (grub_addr_t)-1ll)
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+ {
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+ if (nx_supported)
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+ {
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+ stack_set_attrs &= ~GRUB_MEM_ATTR_X;
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+ stack_clear_attrs |= GRUB_MEM_ATTR_X;
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+ }
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+
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+ grub_dprintf ("nx", "Setting attributes for stack at 0x%"PRIxGRUB_ADDR"-0x%"PRIxGRUB_ADDR" to rw%c\n",
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+ grub_stack_addr, grub_stack_addr + grub_stack_size - 1,
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+ (stack_set_attrs & GRUB_MEM_ATTR_X) ? 'x' : '-');
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+
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+ grub_update_mem_attrs (grub_stack_addr, grub_stack_size,
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+ stack_set_attrs, stack_clear_attrs);
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+
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+ grub_get_mem_attrs (grub_stack_addr, 4096, &attrs);
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+ grub_dprintf ("nx", "permissions for 0x%"PRIxGRUB_ADDR" are %s%s%s\n",
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+ grub_stack_addr,
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+ (attrs & GRUB_MEM_ATTR_R) ? "r" : "-",
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+ (attrs & GRUB_MEM_ATTR_W) ? "w" : "-",
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+ (attrs & GRUB_MEM_ATTR_X) ? "x" : "-");
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+ }
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+grub_err_t
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+grub_efi_linux_boot (grub_addr_t kernel_addr, grub_size_t kernel_size, grub_size_t kernel_start,
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grub_off_t handover_offset, void *kernel_params,
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int nx_supported)
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{
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+ grub_addr_t kernel_start_address = kernel_addr + kernel_start;
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grub_efi_loaded_image_t *loaded_image = NULL;
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handover_func hf;
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int offset = 0;
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- grub_uint64_t stack_set_attrs = GRUB_MEM_ATTR_R |
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- GRUB_MEM_ATTR_W |
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- GRUB_MEM_ATTR_X;
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- grub_uint64_t stack_clear_attrs = 0;
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- grub_uint64_t kernel_set_attrs = stack_set_attrs;
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- grub_uint64_t kernel_clear_attrs = stack_clear_attrs;
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- grub_uint64_t attrs;
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int nx_required = 0;
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#ifdef __x86_64__
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@@ -171,41 +282,7 @@ grub_efi_linux_boot (grub_addr_t kernel_addr, grub_size_t kernel_size,
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if (nx_required && !nx_supported)
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return grub_error (GRUB_ERR_BAD_OS, N_("kernel does not support NX loading required by policy"));
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- if (nx_supported)
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- {
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- kernel_set_attrs &= ~GRUB_MEM_ATTR_W;
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- kernel_clear_attrs |= GRUB_MEM_ATTR_W;
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- stack_set_attrs &= ~GRUB_MEM_ATTR_X;
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- stack_clear_attrs |= GRUB_MEM_ATTR_X;
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- }
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-
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- grub_dprintf ("nx", "Setting attributes for 0x%"PRIxGRUB_ADDR"-0x%"PRIxGRUB_ADDR" to r%cx\n",
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- kernel_addr, kernel_addr + kernel_size - 1,
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- (kernel_set_attrs & GRUB_MEM_ATTR_W) ? 'w' : '-');
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- grub_update_mem_attrs (kernel_addr, kernel_size,
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- kernel_set_attrs, kernel_clear_attrs);
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-
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- grub_get_mem_attrs (kernel_addr, 4096, &attrs);
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- grub_dprintf ("nx", "permissions for 0x%"PRIxGRUB_ADDR" are %s%s%s\n",
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- (grub_addr_t)kernel_addr,
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- (attrs & GRUB_MEM_ATTR_R) ? "r" : "-",
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- (attrs & GRUB_MEM_ATTR_W) ? "w" : "-",
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- (attrs & GRUB_MEM_ATTR_X) ? "x" : "-");
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- if (grub_stack_addr != (grub_addr_t)-1ll)
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- {
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- grub_dprintf ("nx", "Setting attributes for stack at 0x%"PRIxGRUB_ADDR"-0x%"PRIxGRUB_ADDR" to rw%c\n",
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- grub_stack_addr, grub_stack_addr + grub_stack_size - 1,
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- (stack_set_attrs & GRUB_MEM_ATTR_X) ? 'x' : '-');
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- grub_update_mem_attrs (grub_stack_addr, grub_stack_size,
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- stack_set_attrs, stack_clear_attrs);
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-
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- grub_get_mem_attrs (grub_stack_addr, 4096, &attrs);
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- grub_dprintf ("nx", "permissions for 0x%"PRIxGRUB_ADDR" are %s%s%s\n",
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- grub_stack_addr,
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- (attrs & GRUB_MEM_ATTR_R) ? "r" : "-",
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- (attrs & GRUB_MEM_ATTR_W) ? "w" : "-",
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- (attrs & GRUB_MEM_ATTR_X) ? "x" : "-");
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- }
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+ grub_efi_mem_set_att (kernel_addr, kernel_size, kernel_start, nx_supported);
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#if defined(__i386__) || defined(__x86_64__)
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asm volatile ("cli");
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@@ -214,7 +291,7 @@ grub_efi_linux_boot (grub_addr_t kernel_addr, grub_size_t kernel_size,
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/* Invalidate the instruction cache */
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grub_arch_sync_caches((void *)kernel_addr, kernel_size);
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|
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|
- hf = (handover_func)((char *)kernel_addr + handover_offset + offset);
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|
+ hf = (handover_func)((char *)kernel_start_address + handover_offset + offset);
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hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);
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|
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|
return GRUB_ERR_BUG;
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diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
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|
index 9854b0defa..c44821608e 100644
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|
--- a/grub-core/loader/i386/efi/linux.c
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|
+++ b/grub-core/loader/i386/efi/linux.c
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|
@@ -41,6 +41,7 @@ static grub_command_t cmd_linuxefi, cmd_initrdefi;
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|
struct grub_linuxefi_context {
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|
void *kernel_mem;
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|
grub_uint64_t kernel_size;
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|
+ grub_uint64_t kernel_start;
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|
grub_uint32_t handover_offset;
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|
struct linux_kernel_params *params;
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|
char *cmdline;
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|
@@ -169,6 +170,7 @@ grub_linuxefi_boot (void *data)
|
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|
|
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|
return grub_efi_linux_boot ((grub_addr_t)context->kernel_mem,
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|
context->kernel_size,
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|
+ context->kernel_start,
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|
context->handover_offset,
|
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|
context->params,
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|
context->nx_supported);
|
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|
@@ -527,7 +529,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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|
LOW_U32(kernel_mem));
|
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|
lh->code32_start = LOW_U32(kernel_mem);
|
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|
|
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|
- grub_memcpy (kernel_mem, (char *)kernel + start, filelen - start);
|
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|
+ grub_memcpy (kernel_mem, (char *)kernel, filelen);
|
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|
|
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|
lh->type_of_loader = 0x6;
|
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|
grub_dprintf ("linux", "setting lh->type_of_loader = 0x%02x\n",
|
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|
@@ -544,6 +546,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
|
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|
goto fail;
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|
context->kernel_mem = kernel_mem;
|
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|
context->kernel_size = kernel_size;
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|
+ context->kernel_start = start;
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|
context->handover_offset = handover_offset;
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|
context->params = params;
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|
context->cmdline = cmdline;
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|
diff --git a/include/grub/efi/linux.h b/include/grub/efi/linux.h
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|
index b82f71006a..0aec66dafb 100644
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|
--- a/include/grub/efi/linux.h
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|
+++ b/include/grub/efi/linux.h
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|
@@ -27,6 +27,7 @@
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|
grub_err_t
|
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|
EXPORT_FUNC(grub_efi_linux_boot) (grub_addr_t kernel_address,
|
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|
grub_size_t kernel_size,
|
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|
+ grub_size_t kernel_start,
|
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|
grub_off_t handover_offset,
|
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|
void *kernel_param, int nx_enabled);
|
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|
|
||||||
|
@@ -38,4 +39,10 @@ EXPORT_FUNC(grub_efi_check_nx_image_support) (grub_addr_t kernel_addr,
|
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|
grub_err_t
|
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|
EXPORT_FUNC(grub_efi_check_nx_required) (int *nx_required);
|
||||||
|
|
||||||
|
+grub_err_t
|
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|
+EXPORT_FUNC(grub_efi_mem_set_att) (grub_addr_t kernel_address,
|
||||||
|
+ grub_size_t kernel_size,
|
||||||
|
+ grub_size_t kernel_start,
|
||||||
|
+ int nx_supported);
|
||||||
|
+
|
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|
#endif /* ! GRUB_EFI_LINUX_HEADER */
|
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|
diff --git a/include/grub/efi/pe32.h b/include/grub/efi/pe32.h
|
||||||
|
index a5e623eb04..131a2c0c3d 100644
|
||||||
|
--- a/include/grub/efi/pe32.h
|
||||||
|
+++ b/include/grub/efi/pe32.h
|
||||||
|
@@ -71,6 +71,17 @@ struct grub_dos_header
|
||||||
|
grub_uint32_t lfanew;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct grub_msdos_image_header
|
||||||
|
+{
|
||||||
|
+ /* This is always 'MZ'. (GRUB_PE32_MAGIC) */
|
||||||
|
+ grub_uint16_t msdos_magic;
|
||||||
|
+
|
||||||
|
+ grub_uint16_t reserved[29];
|
||||||
|
+
|
||||||
|
+ /* The file offset of the PE image header. */
|
||||||
|
+ grub_uint32_t pe_image_header_offset;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
/* According to the spec, the minimal alignment is 512 bytes...
|
||||||
|
But some examples (such as EFI drivers in the Intel
|
||||||
|
Sample Implementation) use 32 bytes (0x20) instead, and it seems
|
||||||
|
@@ -308,6 +319,23 @@ struct grub_pe32_section_table
|
||||||
|
#define GRUB_PE32_SIGNATURE_SIZE 4
|
||||||
|
#define GRUB_PE32_SIGNATURE "PE\0\0"
|
||||||
|
|
||||||
|
+struct grub_pe_image_header
|
||||||
|
+{
|
||||||
|
+ /* This is always PE\0\0. */
|
||||||
|
+ char signature[GRUB_PE32_SIGNATURE_SIZE];
|
||||||
|
+
|
||||||
|
+ /* The COFF file header. */
|
||||||
|
+ struct grub_pe32_coff_header coff_header;
|
||||||
|
+
|
||||||
|
+#if GRUB_TARGET_SIZEOF_VOID_P == 8
|
||||||
|
+ /* The Optional header. */
|
||||||
|
+ struct grub_pe64_optional_header optional_header;
|
||||||
|
+#else
|
||||||
|
+ /* The Optional header. */
|
||||||
|
+ struct grub_pe32_optional_header optional_header;
|
||||||
|
+#endif
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
struct grub_pe32_header
|
||||||
|
{
|
||||||
|
/* This should be filled in with GRUB_PE32_MSDOS_STUB. */
|
||||||
@ -476,3 +476,4 @@ Patch0476: 0476-efi-Add-efitextmode-command-for-getting-setting-the-.patch
|
|||||||
Patch0477: 0477-10_linux.in-escape-kernel-option-characters-properly.patch
|
Patch0477: 0477-10_linux.in-escape-kernel-option-characters-properly.patch
|
||||||
Patch0478: 0478-blscfg-check-if-variable-is-escaped-before-consideri.patch
|
Patch0478: 0478-blscfg-check-if-variable-is-escaped-before-consideri.patch
|
||||||
Patch0479: 0479-osdep-linux-getroot-Detect-DDF-container-similar-to-.patch
|
Patch0479: 0479-osdep-linux-getroot-Detect-DDF-container-similar-to-.patch
|
||||||
|
Patch0480: 0480-Set-correctly-the-memory-attributes-for-the-kernel-P.patch
|
||||||
@ -16,7 +16,7 @@
|
|||||||
Name: grub2
|
Name: grub2
|
||||||
Epoch: 1
|
Epoch: 1
|
||||||
Version: 2.06
|
Version: 2.06
|
||||||
Release: 111%{?dist}
|
Release: 112%{?dist}
|
||||||
Summary: Bootloader with support for Linux, Multiboot and more
|
Summary: Bootloader with support for Linux, Multiboot and more
|
||||||
License: GPLv3+
|
License: GPLv3+
|
||||||
URL: http://www.gnu.org/software/grub/
|
URL: http://www.gnu.org/software/grub/
|
||||||
@ -538,6 +538,10 @@ fi
|
|||||||
%endif
|
%endif
|
||||||
|
|
||||||
%changelog
|
%changelog
|
||||||
|
* Tue Jul 29 2025 Leo Sandoval <lsandova@redhat.com> 2.06-112
|
||||||
|
- Set correctly the memory attributes for the kernel PE sections
|
||||||
|
- Resolves: #RHEL-106075
|
||||||
|
|
||||||
* Tue Jul 29 2025 Nicolas Frayer <nfrayer@redhat.com> 2.06-111
|
* Tue Jul 29 2025 Nicolas Frayer <nfrayer@redhat.com> 2.06-111
|
||||||
- spec/posttrans: move grub config stub creation out of spec
|
- spec/posttrans: move grub config stub creation out of spec
|
||||||
- Resolves: #RHEL-69944
|
- Resolves: #RHEL-69944
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user